It's a mobile world after all, even where PCs are concerned. Canalys today published its latest figures tracking PC sales in Q4, and thanks to the strength of the iPad -- and Canalys' decision to count tablets as 'PCs' -- Apple has once again kept its position at the top, taking 19.5% of all sales, or just under 31 million units. Not counting tablets, Canalys says that PC shipments would have declined 7% compared to Q4 2012 -- "with falls in all regions" -- but with tablets, sales were up 17.9%. More...